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CVE detail

CVE-2021-28799

An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If exploited, the vulnerability allows remote attackers to log in to a device. This issue affects: QNAP Systems Inc. HBS 3 versions prior to v16.0.0415 on QTS 4.5.2; versions prior to v3.0.210412 on QTS 4.3.6; versions prior to v3.0.210411 on QTS 4.3.4; versions prior to v3.0.210411 on QTS 4.3.3; versions prior to v16.0.0419 on QuTS hero h4.5.1; versions prior to v16.0.0419 on QuTScloud c4.5.1~c4.5.4. This issue does not affect: QNAP Systems Inc. HBS 2 . QNAP Systems Inc. HBS 1.3 .

CVSS 10.0 · CriticalBuzz score 67.2KEV listed

Buzz score

Why this CVE is surfacing

Buzz score total 67.2

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 27.7 · diversity 14.5 · KEV 25.0 · OTX 0.0 · PoC 0.0
Mention score
27.7
15 evidence mentions in the snapshot
Diversity score
14.5
5 sources across 2 categories
KEV score
25.0
Known exploited vulnerability present
OTX score
0.0
0 OTX pulses
PoC score
0.0
0 repos · best confidence N/A
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
0
within the 30d window
Peak daily
0
highest bucket

Evidence

Source links by recency

Newest mentions first
15 source links · newest first
  • The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a critical Sophos firewall flaw and seven other issues to its Known Exploited Vulnerabilities Catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added the recently disclosed CVE-2022-1040 flaw in the Sophos firewall, along with seven other issues, to its Known Exploited Vulnerabilities Catalog. According to Binding Operational […]

    newssecurityaffairs.comApr 1, 2022, 8:29 AM
  • A second, custom backdoor was observed being deployed in attacks on four defense contractors if the primary backdoor was removed, security researchers with Palo Alto Networks’ Unit 42 division report.

    newswww.securityweek.comFeb 28, 2022, 11:32 AM
  • SockDetour is a custom backdoor being used to maintain persistence, designed to serve as a backup backdoor in case the primary one is removed.

    vendorunit42.paloaltonetworks.comFeb 24, 2022, 2:00 PM
  • Ivanti, Cyber Security Works and Cyware announced a report which identified 32 new ransomware families in 2021, bringing the total to 157 and representing a 26% increase over the previous year. The report also found that these ransomware groups are continuing to target unpatched vulnerabilities and weaponize zero-day vulnerabilities in record time to instigate crippling attacks. At the same time, they are broadening their attack spheres and finding newer ways to compromise organizational networks and … More →

    newswww.helpnetsecurity.comJan 28, 2022, 6:00 AM
  • QNAP NAS devices are under attack, experts warn of a new Qlocker ransomware campaign that hit devices worldwide. A new wave of Qlocker ransomware it targeting QNAP NAS devices worldwide, the new campaign started on January 6 and it drops ransom notes named !!!READ_ME.txt on infected devices. In May, the Taiwanese vendor QNAP warned its […]

    newssecurityaffairs.comJan 16, 2022, 1:31 PM
  • NAS devices under attack: How to keep them safe?Help Net Security

    Network-attached storage (NAS) devices are a helpful solution for storing, managing, and sharing files and backups and, as such, they are an attractive target for cyber criminals. They are most often used by consumers (on home networks) and small-to-medium businesses (on business networks). Palo Alto Networks researchers recently found some 240,000 QNAP and approximately 3,500 Synology NAS devices exposed to the public internet. Other vendors offering NAS solutions include Zyxel, Western Digital, Seagate, LenovoEMC, and … More →

    newswww.helpnetsecurity.comAug 17, 2021, 4:30 AM
  • A new variant of the eCh0raix ransomware is able to target Network-Attached Storage (NAS) devices from both QNAP and Synology vendors. A newly variant of the eCh0raix ransomware is able to infect Network-Attached Storage (NAS) devices from Taiwanese vendors QNAP and Synology. The eCh0raix ransomware has been active since at least 2019, when eExperts from security firms […]

    newssecurityaffairs.comAug 10, 2021, 3:00 PM
  • A new variant of eCh0raix ransomware targets devices common in the small office and home office. Learn technical details and mitigations.

    vendorunit42.paloaltonetworks.comAug 10, 2021, 10:00 AM
  • Taiwanese vendor QNAP addressed a critical flaw, tracked as CVE-2021-28809, that could be exploited to compromise vulnerable NAS devices. Taiwanese vendor QNAP fixed a critical vulnerability, tracked as CVE-2021-28809, that could be exploited by attackers to compromise vulnerable NAS devices. The vulnerability affects certain legacy versions of HBS 3 Hybrid Backup Sync, it was reported to […]

    newssecurityaffairs.comJul 6, 2021, 8:52 AM
  • Taiwanese network-attached storage (NAS) appliance manufacturer QNAP Systems has revealed that a vulnerability in its Hybrid Backup Sync software has been exploited in Qlocker ransomware attacks.

    newswww.securityweek.comMay 24, 2021, 5:32 PM
  • 24th May – Threat Intelligence ReportCheck Point Research

    For the latest discoveries in cyber research for the week of 24th May, please download our Threat Intelligence Bulletin. Top Attacks and Breaches Check Point Research has discovered multiple misconfiguration flaws in third party cloud services of Android applications, which have led to the exposure of sensitive personal data of more than 100 million Android […]

    vendorresearch.checkpoint.comMay 24, 2021, 5:06 PM
  • QNAP warns customers of updating the HBS 3 disaster recovery app to prevent Qlocker ransomware attack. Taiwanese vendor QNAP is warning its customers of updating the HBS 3 disaster recovery app running on their Network Attached Storage (NAS) devices to prevent Qlocker ransomware infections. At the end of April, experts warned of a new strain […]

    newssecurityaffairs.comMay 22, 2021, 8:15 PM
  • QNAP NAS devices under ransomware attackHelp Net Security

    QNAP NAS device owners are once again under attack by ransomware operators, who are exploiting a recently fixed vulnerability to lock data on vulnerable devices by using the 7-Zip open-source file archiver utility. According to Lawrence Abrams, the ransomware gang has managed to “earn” $260,000 in five days, as many unfortunate victims decided to pay the ransom of 0.01 Bitcoins (around $550) to receive the password that would unlock their files. What happened? On April … More →

    newswww.helpnetsecurity.comApr 26, 2021, 10:38 AM
  • A new ransomware strain dubbed Qlocker is infecting hundreds of QNAP NAS devices every day and demanding a $550 ransom payment. Experts are warning of a new strain of ransomware named Qlocker that is infecting hundreds of QNAP NAS devices on daily bases. The malware moves all files stored on the device to password-protected 7zip […]

    newssecurityaffairs.comApr 23, 2021, 4:54 PM
  • Following a wave of ransomware attacks, network-attached storage (NAS) appliance manufacturer QNAP Systems says it is urgently working on finding a solution to remove malware from infected NAS devices.

    newswww.securityweek.comApr 23, 2021, 1:15 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars
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